The hunt for a former Los Angeles police officer suspected in three killings continued in snow-covered mountains Saturday as the LAPD's chief said he would reopen the disciplinary case that

The hunt for a former Los Angeles police officer suspected in three killings continued in snow-covered mountains Saturday as the LAPD's chief said he would reopen the disciplinary case that led to the fugitive's firing and new details emerged of the evidence he left behind.

Authorities also announced Sunday they are offering a $1 million reward for information leading to the arrest and conviction of fugitive ex-cop Christopher Dorner.

[Public Tip-Line: 1-213-486-6860 / 1-800-222-8477]

On Monday, the Riverside County DA filed murder charges against Dorner that could lead to the death penalty.

This is the largest local reward ever offered. San Diego's Police Officers Association reportedly donated to the cause.

Officials made the announcement during a press conference Sunday afternoon, saying this is not about catching a suspect, but preventing a future crime.

In the meantime, the massive search continued as more clues surface about Dorner's whereabouts.

In surveillance video captured Monday in National city, Dorner is seen dumping supplies, one day after he allegedly killed his first two victims in Irvine.

The owner of an auto parts store in National City describes what an employee found in his dumpster, where Dorner appears to have tossed bullets and other potential evidence.

"He came back with a clip, like a magazine, full of bullets, a belt, a military belt, and a helmet," said the owner. "And he brought it to me and I said where did you find it? He said I find in the back of the dumpster."

Saturday, Customs and Border Protection agents said they are assisting in the search for Dorner, and proceeded to shut down some lanes at the San Diego-Mexico border.

Heavily armored officers, armed with rifles, could be seen surveying vehicles and drivers at the world's busiest border crossing creating a massive bottleneck.

News 8 received a statement from Customs and Border Protection warning travelers who are heading into Mexico.

"CBP is also exercising additional vigilance in southbound inspections in Southern California. As a result, travelers heading southbound into Mexico may experience delays," the statement said.

In the meantime, in Big Bear where Dorner's burnt-out pick up truck was located Thursday morning, a San Diego based U.S. Border Patrol SWAT team is assisting in the ongoing search.

Police are scrambling to find the former LAPD officer and Navy Reservist before he can attack again. He is accused of murdering three people including one police officer, and in an online manifesto has declared war on law enforcement.

While there have been no confirmed sightings of the 33-year-old fugitive in the Big Bear area, there have been a number of false reports throughout San Diego and the rest of southern California; including an incident in which LAPD officers in Torrance shot at two women delivering newspapers Thursday morning who were in a pickup truck similar to Dorner's.